Fixed libedit init file problem

CHANGELOG.rst

@@ -28,6 +28,8 @@ Current Developments
   spaces in their path names
 * Fixed a bug preventing ``source-bash`` from working on Windows
 * Numerous improvements to job control via a nearly-complete rewrite
+* Fixed issue with loading readline init files (inputrc) that seems to be
+  triggered by libedit.
 * Rectified install issue with Jupyter hook when installing with pyenv,
   Jupyter install hook now repects ``--prefix`` argument.
 * Fixed issue with the xonsh.ply subpackage not being installed.

xonsh/readline_shell.py

@@ -69,8 +69,12 @@ def setup_readline():
         readline.parse_and_bind("bind ^I rl_complete")
     else:
         readline.parse_and_bind("tab: complete")
-    # load custom user settings
-    readline.read_init_file()
+    # try to load custom user settings
+    try:
+        readline.read_init_file()
+    except Exception:
+        # this seems to fail with libedit
+        print_exception('xonsh: could not load readline default init file.')
 
 
 def teardown_readline():

xonsh/tools.py

@@ -344,7 +344,7 @@ def suggest_commands(cmd, env, aliases):
     return rtn
 
 
-def print_exception():
+def print_exception(msg=None):
     """Print exceptions with/without traceback."""
     env = getattr(builtins, '__xonsh_env__', os.environ)
     if 'XONSH_SHOW_TRACEBACK' not in env:
@@ -356,6 +356,9 @@ def print_exception():
         exc_type, exc_value, exc_traceback = sys.exc_info()
         exception_only = traceback.format_exception_only(exc_type, exc_value)
         sys.stderr.write(''.join(exception_only))
+    if msg:
+        msg = msg if msg.endswith('\n') else msg + '\n'
+        sys.stderr.write(msg)
 
 
 # Modified from Public Domain code, by Magnus Lie Hetland